CN103800026A - Control method and system for heart CT (computed tomography) and CT machine - Google Patents
Control method and system for heart CT (computed tomography) and CT machine Download PDFInfo
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- CN103800026A CN103800026A CN201210442343.4A CN201210442343A CN103800026A CN 103800026 A CN103800026 A CN 103800026A CN 201210442343 A CN201210442343 A CN 201210442343A CN 103800026 A CN103800026 A CN 103800026A
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- 238000002591 computed tomography Methods 0.000 title claims abstract description 120
- 238000000034 method Methods 0.000 title claims abstract description 39
- 230000033764 rhythmic process Effects 0.000 claims description 186
- 230000000747 cardiac effect Effects 0.000 claims description 84
- 238000012544 monitoring process Methods 0.000 claims description 69
- 238000001514 detection method Methods 0.000 claims description 66
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- 230000033001 locomotion Effects 0.000 claims description 35
- 238000013194 cardioversion Methods 0.000 claims description 27
- 230000000284 resting effect Effects 0.000 claims description 9
- 238000009825 accumulation Methods 0.000 claims description 7
- 238000007689 inspection Methods 0.000 claims description 2
- 230000005855 radiation Effects 0.000 abstract description 5
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- 238000010586 diagram Methods 0.000 description 8
- 206010003119 arrhythmia Diseases 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
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- 230000006793 arrhythmia Effects 0.000 description 1
- 230000036772 blood pressure Effects 0.000 description 1
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Abstract
The invention discloses a control method and a control system for heart CT (computed tomography) and a CT machine. The method comprises the steps of determining the image scanning range of the heart; performing image data acquisition on each scanning segment in the image scanning range in a preset scanning viewing angle range in at least one heart quiescent period, wherein scanning viewing angles of image data in different heart quiescent periods corresponding to single scanning segment are not coincided and are equal to the preset scanning viewing angle range after being accumulated. By adopting the technical scheme disclosed by the invention, the image quality can be improved, and unnecessary X-ray radiation is reduced.
Description
Technical Field
The present invention relates to Computer Tomography (CT), and more particularly to a method and system for controlling cardiac CT scanning and a CT machine.
Background
As a medical device, the CT machine is widely used in the medical and health field to assist a doctor in imaging a patient. Fig. 1 shows a schematic structural diagram of a conventional CT machine. As shown in fig. 1, the CT machine includes: the X-ray CT device comprises a bottom supporting component 1, a CT frame (gantry) 2, an X-ray bulb 3, an X-ray detector 4, a collimator 5 arranged between the X-ray bulb 3 and the X-ray detector 4, a control device 6 and an image reconstruction device 7.
Wherein the CT gantry 2 is generally ring-shaped and is mounted on the bottom support member 1 to be rotatable about its own axis. In general, a direction parallel to the axis of the CT gantry 2 is referred to as a Z direction, a horizontal direction perpendicular to the Z direction is referred to as an X direction, and directions perpendicular to the X direction and the Z direction, respectively, are referred to as Y directions. In some applications, the CT gantry may also be movable in the Z-direction.
The X-ray tube 3 is mounted on the CT gantry 2 and is capable of emitting X-rays in a direction perpendicular to the Z-direction facing the rotation axis.
The collimator 5 has an aperture for confining the X-ray emitted from the X-ray tube 3 so that the X-ray emitted from the X-ray tube 3 becomes an X-ray beam having a predetermined rectangular shape in the Z-direction and a predetermined fan shape on the XY-plane. Wherein, the fan-shaped projection of the X-ray tube 3 on the XY plane is also called the fan-shaped projection of the X-ray tube 3 on the phi direction.
The X-ray detector 4 is installed on the CT gantry 2 at a position opposite to the X-ray tube 3, and is configured to receive an X-ray beam emitted by the X-ray tube 3 and restricted by the collimator 5, convert the X-ray beam into image information, and output the image information to the image reconstruction device 7.
In CT scanning, for each scanning segment (or called slice), in order to meet the requirements of image reconstruction, it is generally necessary to acquire information of a target object from multiple angles, and then perform image reconstruction of the target object based on the information acquired from multiple angles.
In order to acquire information of a target object at multiple angles, a scanning visual angle range is usually set, the control device 6 controls the CT frame 2 to drive the X-ray tube 3 and the X-ray detector 4 to rotate around the axis of the CT frame 2, and in the rotating process, the X-ray tube 3 is controlled to emit X-rays and the X-ray detector 4 is controlled to collect and receive the X-rays emitted by the X-ray tube 3 based on a time triggering or position triggering mode, so that multi-angle scanning triggering control within the scanning visual angle range is realized. The position where the X-ray tube 3 emits X-rays to realize projection is generally referred to as a projection position, and the included angle between the projection position where the X-ray tube 3 emits X-rays and the initial zero degree is generally referred to as a projection angle (or referred to as a viewing angle).
The image reconstruction device 7 is configured to receive the image information output by the X-ray detector 4, and perform image reconstruction according to the image information corresponding to all projection positions in each scanning cycle and the information of the projection angles thereof.
When a cardiac scan is performed, since the heart is a moving organ, in order to obtain satisfactory image quality at a low radiation dose, it is necessary to avoid the beat signals of the heart according to the motion cycle of the heart and perform a scan of a current scan segment in a quiet cycle between two beat signals of the heart. In order to determine the current movement state of the heart for performing a CT scan during the quiet period of the heart, it is now common to synchronize the CT scan data with EKG (electrocardiogram) signals as the heart rate signals, or alternatively with blood pressure signals of the mechanical pulse of the patient as the heart rate signals. Some existing cardiac CT scans usually control the exposure amount of X-rays based on predicting the occurrence time of heartbeats, but in practical applications, arrhythmia caused by patient stress or abnormal heart and the like often occurs, so that the heartbeat timing prediction is often inaccurate, which may cause image quality reduction caused by unexpected heartbeats and unnecessary X-ray radiation caused thereby.
Disclosure of Invention
In view of the above, the present invention provides a method for controlling cardiac CT scanning, and a system and a CT machine for controlling cardiac CT scanning, so as to improve image quality and reduce unnecessary X-ray radiation.
The invention provides a control method of cardiac CT scanning, which comprises the following steps: A. determining an image scanning range of the heart; B. for each scanning segment in the image scanning range, completing image data acquisition in a preset scanning view angle range in at least one cardiac resting period; the scanning view angles of the image data in different cardiac stationary periods corresponding to a single scanning segment are not coincident and equal to a preset scanning view angle range after accumulation.
In one embodiment of the present invention, the step B includes: b1, moving the initial scanning segment of the heart into the scanning area according to the image scanning range; b2, detecting a first heart rate signal of the heart; b3, after the first rhythm signal is detected, judging whether a second rhythm signal is not detected within a preset waiting time, if so, starting scanning, and executing the step B4; otherwise, taking the second rhythm signal as a first rhythm signal, and returning to execute the step B3; b4, judging whether a second rhythm signal is detected before the image data acquisition within the preset scanning view angle range is finished, if so, stopping scanning, taking the second rhythm signal as a first rhythm signal, and executing the step B5; otherwise, stopping scanning after finishing the image data acquisition within the preset scanning view angle range, and executing step B8; b5, judging whether a second rhythm signal is not detected within the preset waiting time, if so, executing the step B6; otherwise, taking the second rhythm signal as a first rhythm signal, and returning to execute the step B5; b6, judging whether the current scanning visual angle is coincident with the scanning visual angle corresponding to the collected image data, if not, starting scanning, and returning to execute the step B4; otherwise, go to step B7; b7, judging whether a second heart rate signal of the heart is detected, if so, taking the second heart rate signal as a first heart rate signal, and returning to execute the step B5; otherwise, returning to execute the step B6; b8, judging whether the scanning in the image scanning range is finished, if so, ending; otherwise, go to step B9; b9, moving the next scanning segment of the heart into the scanning area; and returns to performing step B2.
In one embodiment of the present invention, the step B9 of moving the next scan segment of the heart into the scan region is: the CT gantry and/or the patient table are moved such that the next scan segment of the heart is located within the scan region. In still another embodiment of the present invention, the step B includes: b1, determining the initial scanning position of the spiral scanning according to the image scanning range; b2, moving the patient table at a set speed; b3, starting scanning by using low X-ray dose after the initial scanning position enters the scanning area; b4, detecting a first heart rate signal of the heart; b5, after the first rhythm signal is detected, judging whether a second rhythm signal is not detected within a preset waiting time, if so, increasing the X-ray dose, and executing the step B6; otherwise, go to step B7; b6, judging whether a second cardiorhythm signal is detected before the image data acquisition within the preset scanning view angle range is finished, if so, reducing the X-ray dose, and executing the step B8; otherwise, after completing the image data acquisition within the preset scanning view angle range, reducing the X-ray dose, and executing the step B12; b7, moving the CT gantry along the moving direction of the patient table to make the relative position between the CT gantry and the patient table be at the position when the first rhythm signal is detected, using the second rhythm signal as the first rhythm signal, and returning to execute the step B5; b8, moving the CT gantry along the moving direction of the patient table so that the relative position between the CT gantry and the patient table is at the position when the first rhythm signal is detected, taking the second rhythm signal as the first rhythm signal, and executing step B9; b9, judging whether a second rhythm signal is not detected within the preset waiting time, if so, executing the step B10; otherwise, returning to execute the step B8; b10, judging whether the current scanning view angle is coincident with the scanning view angle corresponding to the collected image data, if not, increasing the X-ray dosage, and executing the step B6; otherwise, go to step B11; b11, judging whether a second heart rate signal of the heart is detected, if so, returning to execute the step B8; otherwise, returning to execute the step B10; b12, judging whether the scanning in the image scanning range is finished, if so, stopping scanning and ending; otherwise, return to execute step B4.
In one embodiment of the present invention, step B5 further includes: recording a relative position between the CT gantry and the patient table after detecting the first cardioversion signal; moving the CT gantry in the direction of the patient table movement as described in steps B7 and B8 such that the relative position between the CT gantry and the patient table at the time the first cardioversion signal is detected is: the CT gantry is moved in the direction of movement of the patient table such that the relative position between the CT gantry and the patient table is at the relative position between the CT gantry and the patient table recorded when the first cardioversion signal was detected.
In one embodiment of the invention, the method further comprises: and for each scanning segment of the heart, reconstructing the data of the scanning segment by using the acquired image data in the preset scanning visual angle range.
In one embodiment of the present invention, the first and second heart rate signals are R-wave signals on an electrocardiogram.
The invention provides a control system for cardiac CT scanning, which comprises: the scanning execution device comprises an X-ray bulb tube as an X-ray source and an X-ray detector for receiving X-rays from the X-ray bulb tube; the control device comprises an image scanning range determining unit and an image scanning control unit; the image scanning range determining unit is used for determining the image scanning range of the heart; the image scanning control unit is used for controlling the scanning execution device to complete image data acquisition within a preset scanning view angle range in at least one cardiac resting period for each scanning segment within the image scanning range; the scanning view angles of the image data in different cardiac stationary periods corresponding to a single scanning segment are not coincident and equal to a preset scanning view angle range after accumulation.
In one embodiment of the invention, the system further comprises: a scanning segment moving device and a rhythm signal detecting device; the image scanning control unit includes: the device comprises a first judgment control module, a second judgment control module, a third judgment control module, a fourth judgment control module and an image data judgment module; the scanning segment moving device is used for moving an initial scanning segment of the heart to a scanning area according to the image scanning range when scanning is started, and sending a monitoring instruction to the first judgment control module; after receiving the movement instruction of the image data judgment module, moving the next scanning segment of the heart into the scanning area, and sending a monitoring instruction to the first judgment control module; the heart rhythm signal detection device is used for detecting a first heart rhythm signal and a second heart rhythm signal of a heart and indicating the first heart rhythm signal or the second heart rhythm signal to the first judgment control module, the second judgment control module, the third judgment control module and the fourth judgment control module when the first heart rhythm signal or the second heart rhythm signal is detected; the first judgment control module is used for judging whether a first heart rate signal indicated by the heart rate signal detection device is received or not after receiving a monitoring instruction from the scanning segment mobile device, judging whether a second heart rate signal indicated by the heart rate signal detection device is not received within preset waiting time or not after receiving the first heart rate signal, controlling the scanning execution device to start scanning if the second heart rate signal is not received within the preset waiting time, and sending the monitoring instruction to the second judgment control module; if the second heart rate signal indicated by the heart rate signal detection device is received within the preset waiting time, the second heart rate signal is used as the first heart rate signal, and the operation of judging whether the second heart rate signal indicated by the heart rate signal detection device is not received within the preset waiting time is returned; the second judgment control module is used for judging whether a second cardioversion signal indicated by the cardioversion signal detection device is received before the scanning execution device finishes image data acquisition in a preset scanning visual angle range after receiving a monitoring instruction from the first judgment control module or the fourth judgment control module, if so, controlling the scanning execution device to stop scanning, taking the second cardioversion signal as a first cardioversion signal, and sending a monitoring instruction to the third judgment control module; otherwise, after the scanning execution device finishes the image data acquisition within the preset scanning visual angle range, controlling the scanning execution device to stop scanning, and sending a scanning segment acquisition finishing instruction to the image data judgment module; the third judgment control module is used for judging whether a second heart rate signal indicated by the heart rate signal detection device is not received within the preset waiting time after receiving the monitoring indication from the second judgment control module or the fourth judgment control module, and if so, sending the monitoring indication to the fourth judgment control module; if the second heart rate signal indicated by the heart rate signal detection device is received within the preset waiting time, the second heart rate signal is used as the first heart rate signal, and the operation of judging whether the second heart rate signal indicated by the heart rate signal detection device is not received within the preset waiting time is returned; the fourth judgment control module is used for judging whether the current scanning visual angle is overlapped with the scanning visual angle corresponding to the collected image data after receiving the monitoring instruction from the third judgment control module, controlling the scanning execution device to start scanning if the current scanning visual angle is not overlapped with the scanning visual angle corresponding to the collected image data, and sending the monitoring instruction to the second judgment control module; if the current scanning visual angle is not coincident with the scanning visual angle corresponding to the acquired image data, judging whether a second rhythm signal indicated by the rhythm signal detection device is received or not, if so, taking the second rhythm signal as a first rhythm signal, and sending a monitoring indication to a third judgment control module; if the second heart rhythm signal indicated by the heart rhythm signal detection device is not received, continuing to execute the operation of judging whether the current scanning visual angle is overlapped with the scanning visual angle corresponding to the acquired image data; the image data judgment module is used for judging whether the scanning within the image scanning range is finished or not after receiving a scanning segment acquisition finishing instruction from the second judgment control module, and if so, ending the cardiac CT scanning; otherwise, sending a movement instruction to the scanning segment moving device.
In one embodiment of the present invention, the scan segment moving device is: a table mover and/or a CT gantry mover.
In yet another embodiment of the present invention, the system further comprises: the system comprises an inspection table moving device, a CT rack moving device and a rhythm signal detection device; the image scanning control unit includes: the device comprises an initial scanning position determining module, a first judging control module, a second judging control module, a third judging control module, a fourth judging control module, a fifth judging control module and an image data judging module; the initial scanning position determining module is used for determining the initial scanning position of the spiral scanning according to the image scanning range; the examination table moving device is used for moving the patient examination table at a set speed; the first judgment control module is used for controlling the scanning execution device to start scanning with low X-ray dosage after judging that the initial scanning position enters the scanning area, and sending a monitoring instruction to the second judgment control module; the heart rhythm signal detection device is used for detecting a first heart rhythm signal and a second heart rhythm signal of a heart and indicating the first heart rhythm signal or the second heart rhythm signal to the second judgment control module, the third judgment control module, the fourth judgment control module and the fifth judgment control module when the first heart rhythm signal or the second heart rhythm signal is detected; the second judgment control module is used for judging whether a first rhythm signal indicated by the rhythm signal detection device is received or not after receiving the monitoring indication of the first judgment control module or the monitoring indication of the image data judgment module, judging whether a second rhythm signal indicated by the rhythm signal detection device is not received within preset waiting time or not after receiving the first rhythm signal, and if so, controlling the scanning execution device to increase the X-ray dosage and sending a monitoring indication to the third judgment control module; if the second heart rate signal indicated by the heart rate signal detection device is received within the preset waiting time, sending a movement instruction to the CT rack moving device, taking the second heart rate signal as the first heart rate signal, and returning to execute the operation of judging whether the second heart rate signal indicated by the heart rate signal detection device is not received within the preset waiting time; the third judgment control module is used for judging whether a second cardioversion signal indicated by the cardioversion signal detection device is received before the scanning execution device finishes image data acquisition within a preset scanning visual angle range after receiving a monitoring instruction from the second judgment control module or the fifth judgment control module, if so, controlling the scanning execution device to reduce X-ray dosage, sending a movement instruction to the CT rack moving device, then taking the second cardioversion signal as a first cardioversion signal, and sending a monitoring instruction to the fourth judgment control module; otherwise, after the scanning execution device finishes the image data acquisition within the preset scanning visual angle range, controlling the scanning execution device to reduce the X-ray dosage and sending a scanning segment acquisition finishing instruction to the image data judgment module; the CT rack moving device is used for moving the CT rack along the moving direction of the patient examination table according to the moving instruction from the second judgment control module, the third judgment control module, the fourth judgment control module or the fifth judgment control module, so that the relative position between the CT rack and the patient examination table is the position when the cardiac rhythm signal detection device detects the first cardiac rhythm signal; the fourth judgment control module is used for judging whether the second rhythm signal is not detected within the preset waiting time according to the monitoring instruction from the third judgment control module or the fifth judgment control module, and if so, sending the monitoring instruction to the fifth judgment control module; if the second heart rate signal indicated by the heart rate signal detection device is received within the preset waiting time, sending a movement instruction to the CT rack moving device, taking the second heart rate signal as the first heart rate signal, and returning to execute the operation of judging whether the second heart rate signal indicated by the heart rate signal detection device is not received within the preset waiting time; the fifth judgment control module is used for judging whether the current scanning visual angle is overlapped with the scanning visual angle corresponding to the collected image data or not after receiving the monitoring instruction from the fourth judgment control module, if not, controlling the scanning execution device to increase the X-ray dosage and sending the monitoring instruction to the third judgment control module; if the current scanning visual angle is not coincident with the scanning visual angle corresponding to the acquired image data, judging whether a second rhythm signal indicated by the rhythm signal detection device is received or not, if so, sending a movement indication to the CT rack moving device, taking the second rhythm signal as a first rhythm signal, and sending a monitoring indication to a fourth judgment control module; if the second heart rhythm signal indicated by the heart rhythm signal detection device is not received, continuing to execute the operation of judging whether the current scanning visual angle is overlapped with the scanning visual angle corresponding to the acquired image data; the image data judgment module is used for judging whether the scanning within the image scanning range is finished or not after receiving the scanning segment acquisition finishing instruction from the third judgment control module, and if so, controlling the scanning execution device to stop scanning and finish the cardiac CT scanning; otherwise, sending a monitoring instruction to the second judgment control module.
In one embodiment of the invention, the CT gantry moving means further records the relative position between the CT gantry and the patient table after the cardiac rhythm signal is detected by the cardiac rhythm signal detecting means; upon receiving the movement indication, the CT gantry is moved in the direction of movement of the patient table such that the relative position between the CT gantry and the patient table is at the relative position between the CT gantry and the patient table recorded when the first cardioversion signal was detected.
The CT machine provided by the invention comprises a control system of the cardiac CT scanning in any one of the specific implementation forms.
In the above scheme, after the image scanning range of the heart is determined, the image data acquisition in the preset scanning view angle range can be completed for each scanning segment in the image scanning range in at least one heart resting period; the scanning view angles of the image data corresponding to the single scanning segment in different cardiac stationary periods are not coincident and are equal to the preset scanning view angle range after accumulation, so that the method can compensate the unexpected heartbeat signal, ensure that a satisfactory image can be obtained by one-time scanning, improve the image quality, avoid scanning the patient again to obtain the missing image part, and reduce unnecessary X-ray radiation.
Drawings
The foregoing and other features and advantages of the invention will become more apparent to those skilled in the art to which the invention relates upon consideration of the following detailed description of a preferred embodiment of the invention with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of a conventional CT machine.
Fig. 2 is an exemplary flowchart of a control method for cardiac CT scanning according to an embodiment of the present invention.
Fig. 3 is an exemplary block diagram of a control system for cardiac CT scanning according to an embodiment of the present invention.
Fig. 4 is a flowchart illustrating a control method for cardiac CT step-by-step scanning according to a second embodiment of the present invention.
Fig. 5 is a schematic electrocardiogram in one example.
Fig. 6 is a schematic structural diagram of a control system for cardiac CT step-by-step scanning according to a second embodiment of the present invention.
Fig. 7a to 7c are schematic views of a cardiac CT step scan according to an example of the present invention. Fig. 7a shows the condition that the heart rhythm is not abnormal during the scanning process, and fig. 7b and 7c show the condition that the heart rhythm is abnormal during the scanning process.
Fig. 8 is a flowchart illustrating a control method for spiral scanning of cardiac CT according to a third embodiment of the present invention.
Fig. 9 is a schematic structural diagram of a control system for spiral scanning of cardiac CT in the third embodiment of the present invention.
Fig. 10a to 10c are schematic views of a step-by-step cardiac CT scan according to an example of the present invention. Fig. 10a shows the condition that the heart rhythm is not abnormal during the scanning process, and fig. 10b and 10c show the condition that the heart rhythm is abnormal during the scanning process.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by referring to the following examples.
Example one
Fig. 2 is an exemplary flowchart of a control method for cardiac CT scanning according to an embodiment of the present invention. As shown in fig. 2, the process mainly includes the following steps:
in step 201, an image scanning range of the heart is determined.
Further, the method may further comprise: and for each scanning segment of the heart, reconstructing the data of the scanning segment by using the acquired image data in the preset scanning visual angle range.
Fig. 3 is an exemplary block diagram of a control system for cardiac CT scanning according to an embodiment of the present invention. As shown in fig. 3, the system includes: a scan execution means 301 and a control means 302.
Therein, the scan execution means 301 comprises an X-ray tube 3 as an X-ray source and an X-ray detector 4 for receiving X-rays from said X-ray tube.
The control apparatus 302 includes an image scanning range determining unit 3021 and an image scanning control unit 3022.
The image scanning range determining unit 3021 is used to determine the image scanning range of the heart.
The image scanning control unit 3022 is configured to control the scanning execution device 301 to complete image data acquisition within a preset scanning view angle range in at least one cardiac resting period for each scanning segment within the image scanning range; the scanning view angles of the image data in different cardiac stationary periods corresponding to a single scanning segment are not coincident and equal to a preset scanning view angle range after accumulation.
Further, the system may further include: and the image reconstruction device is used for reconstructing data of each scanning segment of the heart by using the image data in the preset scanning view angle range acquired by the scanning execution device 301.
The current CT scanning modes mainly include step scanning and spiral scanning. The method and system described in embodiment one will be described in further detail below with specific embodiments of step-scan and spiral-scan.
Example two: step-by-step scanning
Fig. 4 is a flowchart illustrating a control method for cardiac CT step-by-step scanning according to a second embodiment of the present invention. As shown in fig. 4, the process mainly includes the following steps:
in step 401, an image scan range of the heart is determined.
In this step, the initial scan segment of the heart can be moved into the scan region by moving the patient table. Alternatively, in practice, the initial scan segment of the heart may be moved into the scan region by moving the CT gantry. Alternatively, the CT gantry and the patient table may be moved simultaneously to move the initial scan segment of the heart into the scan region.
In step 403, a first heart rate signal of the heart is detected. After the first heart rate signal is detected, step 404 is performed.
In this embodiment, the first heart rate signal is a heart beat signal of the heart, i.e., an R-wave signal on an electrocardiogram as shown in fig. 5.
In this step, the preset waiting time may be set according to an empirical value or other actual requirements. For example, in order to acquire higher quality image data, a waiting time may be set such that the start position of the scan avoids the section corresponding to the contraction motion of the heart. Alternatively, a waiting time may be set to place the start of the scan late in the systolic motion of the heart in order to ensure as much as possible that the data needed to acquire the reconstructed images are acquired during the quiet period of the heart. And will not be described in detail herein.
In this embodiment, the second heart rate signal is a heartbeat signal located after the first heart rate signal, and is referred to the first heart rate signal.
And step 405, taking the second rhythm signal as the first rhythm signal, and returning to execute the step 404.
In this step, the preset scan view angle range is determined according to the angle of the image data required for reconstructing the image. For example, in some applications, the scan view range employs [0, π + β [ ]F]A plurality of angles of the angular region. Wherein, betaFThe maximum fan angle of the X-ray tube 3 in the direction phi in fig. 1.
And step 410, taking the second heart rate signal as a first heart rate signal.
Accordingly, in this step, the next scan segment of the heart can be located in the scan region by moving the patient table. Alternatively, in practice, the CT gantry may be moved so that the next scan segment of the heart is located within the scan region. Alternatively, the CT gantry and the patient table can be moved simultaneously such that the next scan segment of the heart is located in the scan region.
In the embodiment, for the situation that only the CT frame is moved, the problem that the heart shakes under the action of inertia after the patient examination table stops when the patient examination table is moved can be avoided, so that the quality of scanned images can be further ensured.
Fig. 6 is a schematic structural diagram of a control system for cardiac CT step-by-step scanning according to a second embodiment of the present invention. As shown in fig. 6, the system further includes, on the basis of the system shown in fig. 3: a sweep segment moving means 303 and a heart rhythm signal detecting means 304. In addition, the image scanning control unit 3022 in the second embodiment may specifically include: a first judgment control module 601, a second judgment control module 602, a third judgment control module 603, a fourth judgment control module 604 and an image data judgment module 605.
The scanning segment moving device 303 is configured to, when starting scanning, move an initial scanning segment of the heart into a scanning area according to the image scanning range, and send a monitoring instruction to the first determining control module 601; after receiving the moving instruction of the image data determination module 605, the next scanning segment of the heart is moved into the scanning area, and a monitoring instruction is sent to the first determination control module 601. In this embodiment, the scan segment moving device 303 is a CT gantry moving device. In practical applications, the scan segment moving device 303 may also be a table moving device. Alternatively, the scan segment transfer device 303 may also comprise both a CT gantry transfer device and a table transfer device.
The heart rhythm signal detection device 304 is configured to detect a first heart rhythm signal and a second heart rhythm signal of a heart, and when the first heart rhythm signal or the second heart rhythm signal is detected, instruct the first heart rhythm signal or the second heart rhythm signal to the first determination control module 601, the second determination control module 602, the third determination control module 603, and the fourth determination control module 604. In this embodiment, the cardiac rhythm signal detection device 304 is an electrocardiograph. The first and second heart rate signals are R-wave signals on the electrocardiogram, and the second heart rate signal is an R-wave signal located after the first heart rate signal with respect to the first heart rate signal.
The first determining control module 601 is configured to determine whether a first heart rate signal indicated by the heart rate signal detecting device 304 is received after receiving a monitoring instruction from the scan segment moving device 303, determine whether a second heart rate signal indicated by the heart rate signal detecting device 304 is not received within a preset waiting time after receiving the first heart rate signal, if so, control the scan executing device 301 to start scanning, and send a monitoring instruction to the second determining control module 602; otherwise, if the second heart rate signal indicated by the heart rate signal detection device 304 is received within the preset waiting time, the second heart rate signal is used as the first heart rate signal, and the operation of judging whether the second heart rate signal indicated by the heart rate signal detection device is not received within the preset waiting time is returned.
The second determination control module 602 is configured to determine, after receiving a monitoring instruction from the first determination control module 601 or the fourth determination control module 604, whether a second cardiac rhythm signal indicated by the cardiac rhythm signal detection device 304 is received before the scanning execution device 301 completes image data acquisition within a preset scanning view range, if so, control the scanning execution device 301 to stop scanning, use the second cardiac rhythm signal as a first cardiac rhythm signal, and send a monitoring instruction to the third determination control module 603; otherwise, after the scanning execution device 301 finishes the image data acquisition within the preset scanning view angle range, the scanning execution device 301 is controlled to stop scanning, and send a scanning segment acquisition completion instruction to the image data determination module 605.
The third determining control module 603 is configured to determine whether the second cardiac rhythm signal indicated by the cardiac rhythm signal detecting device 304 is not received within a preset waiting time after receiving the monitoring instruction from the second determining control module 602 or the fourth determining control module 604, and if so, send the monitoring instruction to the fourth determining control module 604; otherwise, if the second heart rate signal indicated by the heart rate signal detection device 304 is received within the preset waiting time, the second heart rate signal is used as the first heart rate signal, and the operation of determining whether the second heart rate signal indicated by the heart rate signal detection device 304 is not received within the preset waiting time is returned.
The fourth determination control module 604 is configured to determine whether the current scanning angle coincides with a scanning angle corresponding to the acquired image data after receiving the monitoring instruction from the third determination control module 603, and if the current scanning angle does not coincide with the scanning angle corresponding to the acquired image data, control the scanning execution device 301 to start scanning and send the monitoring instruction to the second determination control module 602; otherwise, if the current scanning view angle coincides with the scanning view angle corresponding to the acquired image data, it is determined whether a second rhythm signal indicated by the rhythm signal detection device 304 is received, and if so, the second rhythm signal is used as a first rhythm signal and a monitoring indication is sent to the third determination control module 603; otherwise, if the second heart rate signal indicated by the heart rate signal detection device 304 is not received, the operation of determining whether the current scanning view angle coincides with the scanning view angle corresponding to the acquired image data is continuously performed.
The image data determining module 605 is configured to determine whether to complete scanning within the image scanning range after receiving a scan segment acquisition completion instruction from the second determining control module 602, and if so, end cardiac CT scanning; otherwise, a move indication is sent to the scan segment moving means 303.
The scheme in the second embodiment is illustrated by an example.
Fig. 7a to 7c are schematic views of a cardiac CT step scan according to an example of the present invention. Fig. 7a shows the condition that the heart rhythm is not abnormal during the scanning process, and fig. 7b and 7c show the condition that the heart rhythm is abnormal during the scanning process.
For the cardiac image scanning range H at the upper left corner in fig. 7a to 7c, taking the example of dividing four scanning segments as an example in fig. 7a, since no abnormality occurs to the heart rhythm, each scanning segment completes the image data acquisition within the preset scanning view angle range within one cardiac resting period, i.e. four shaded regions between R01 and R02, between R02 and R03, between R03 and R04, and between R04 and R05 in fig. 7 a. In fig. 7b, after the scanning of the initial scanning segment is completed between R11 and R12, since R13 is detected within a preset waiting time after R12 and R14 is detected within a preset waiting time after R13, that is, a heart rate abnormality occurs after R12, the scanning of the second scanning segment is not started until after R14, and since no heart rate abnormality occurs after R14, the scanning of the remaining three scanning segments is completed between R14 and R15, between R15 and R16, and between R16 and R17, respectively. In fig. 7c, after the scanning of the initial scanning segment is completed between R21 and R22, R23 is not detected within a preset waiting time after R22, so that the scanning of the second scanning segment is started, but since R23 is detected before the image data acquisition within the preset scanning view angle range is completed, that is, a cardiac rhythm abnormality occurs after R22, only a part of the image data acquisition of the second scanning segment is completed between R22 and R23, R24 is detected within the preset waiting time immediately after R23, and a cardiac rhythm abnormality does not occur after R24, so that the remaining image data acquisition of the second scanning segment is completed between R24 and R25, and then the scanning of the remaining two scanning segments is completed between R25 and R26 and between R26 and R27, respectively.
Example three: helical scanning
Fig. 8 is a flowchart illustrating a control method for spiral scanning of cardiac CT according to a third embodiment of the present invention. As shown in fig. 8, the process mainly includes the following steps:
in step 801, an image scan range of a heart is determined.
At step 804, after the initial scan position enters the scan region, a scan is initiated using a low X-ray dose.
At step 805, a first cardiac rhythm signal of a heart is detected. After the first heart rate signal is detected, step 806 is performed.
In this embodiment, the first heart rate signal is a heart beat signal of the heart. For example, an R-wave signal on an electrocardiogram.
In this step, the preset waiting time may be set according to an empirical value or other actual requirements. For example, in order to acquire higher quality image data, a waiting time may be set such that the start position of the scan avoids the section corresponding to the contraction motion of the heart. Alternatively, a waiting time may be set to place the start of the scan late in the systolic motion of the heart in order to ensure as much as possible that the data needed to acquire the reconstructed images are acquired during the quiet period of the heart. And will not be described in detail herein.
In this embodiment, the second heart rate signal is a heartbeat signal located after the first heart rate signal, and is referred to the first heart rate signal.
In step 807, the CT gantry is moved in the direction of movement of the patient table such that the relative position between the CT gantry and the patient table is at the position when the first rhythm signal is detected, the second rhythm signal is taken as the first rhythm signal, and the procedure returns to perform step 806.
In this step, the preset scan view angle range is determined according to the angle of the image data required for reconstructing the image. For example, in some applications, the scan view range employs [0, π + β [ ]F]A plurality of angles of the angular region. Wherein, betaFThe maximum fan angle of the X-ray tube 3 in the direction phi in fig. 1.
And 812, moving the CT frame along the moving direction of the patient examination table, so that the relative position between the CT frame and the patient examination table is at the position when the first rhythm signal is detected, and taking the second rhythm signal as the first rhythm signal.
817, judging whether the scanning in the image scanning range is finished, if so, stopping scanning and ending; otherwise, go back to execute step 805.
In this embodiment, step 805 may be followed by: after the first cardioversion signal is detected, the relative position between the CT gantry and the patient table is recorded. Accordingly, the moving of the CT gantry in the direction of the patient table movement in steps 807 and 812 such that the relative position between the CT gantry and the patient table is at the position when the first rhythm signal is detected may be: the CT gantry is moved in the direction of movement of the patient table such that the relative position between the CT gantry and the patient table is at the relative position between the CT gantry and the patient table recorded when the first cardioversion signal was detected.
In this embodiment, since the second rhythm signal is detected within the preset waiting time or before the image data acquisition within the preset scanning view angle range is completed when the heart rhythm is abnormal, the missed heart region is compensated by moving the CT gantry, instead of compensating the missed heart region by retracting the patient table, the problem that the heart shakes under the inertia effect after the patient table stops when the patient table is retracted can be avoided, and thus the quality of the scanned image can be further ensured.
Fig. 9 is a schematic structural diagram of a control system for spiral scanning of cardiac CT in the third embodiment of the present invention. As shown in fig. 9, the system further includes, on the basis of the system shown in fig. 3: a table moving device 305, a CT gantry moving device 306 and a cardiac rhythm signal detecting device 304. In addition, the image scanning control unit 3022 in the second embodiment may specifically include: an initial scanning position determining module 901, a first judgment control module 902, a second judgment control module 903, a third judgment control module 904, a fourth judgment control module 905, a fifth judgment control module 906, and an image data judgment module 907.
The initial scanning position determining module 901 is configured to determine an initial scanning position of the helical scanning according to the image scanning range.
The table moving means 305 are used to move the patient table at a set speed.
The first determining control module 902 is configured to control the scan execution apparatus 301 to start scanning with a low X-ray dose after determining that the initial scanning position enters the scanning area, and send a monitoring instruction to the second determining control module 903.
The heart rhythm signal detection device 304 is configured to detect a first heart rhythm signal and a second heart rhythm signal of a heart, and when the first heart rhythm signal or the second heart rhythm signal is detected, instruct the first heart rhythm signal or the second heart rhythm signal to the second determination control module 903, the third determination control module 904, the fourth determination control module 905, and the fifth determination control module 906.
The second determination control module 903 is configured to determine whether a first cardiac rhythm signal indicated by the cardiac rhythm signal detection device 304 is received after receiving the monitoring instruction of the first determination control module 902 or the monitoring instruction of the image data determination module 907, determine whether a second cardiac rhythm signal indicated by the cardiac rhythm signal detection device 304 is not received within a preset waiting time after receiving the first cardiac rhythm signal, and if so, control the scanning execution device 301 to increase the X-ray dose and send a monitoring instruction to the third determination control module 904; otherwise, if the second heart rate signal indicated by the heart rate signal detection device 304 is received within the preset waiting time, a moving instruction is sent to the CT gantry moving device 306, and then the second heart rate signal is used as the first heart rate signal, and the operation of determining whether the second heart rate signal indicated by the heart rate signal detection device 304 is not received within the preset waiting time is returned.
The third determination control module 904 is configured to determine, after receiving the monitoring instruction from the second determination control module 903 or the fifth determination control module 906, whether a second cardiac rhythm signal indicated by the cardiac rhythm signal detection device 304 is received before the scanning execution device 301 completes image data acquisition within the preset scanning view angle range, if so, control the scanning execution device 301 to reduce the X-ray dose, send a movement instruction to the CT gantry moving device 306, then use the second cardiac rhythm signal as a first cardiac rhythm signal, and send a monitoring instruction to the fourth determination control module 905; otherwise, after the scan execution device 301 completes the image data acquisition within the preset scan view angle range, the scan execution device 301 is controlled to reduce the X-ray dose, and send a scan segment acquisition completion indication to the image data determination module 907.
The CT gantry moving device 306 is configured to move the CT gantry along the direction of the movement of the patient table according to the movement instruction from the second determination control module 903, the third determination control module 904, the fourth determination control module 905, or the fifth determination control module 906, so that the relative position between the CT gantry and the patient table is the position when the first heart rate signal is detected by the heart rate signal detecting device 304.
The fourth determination control module 905 is configured to determine whether the second cardiorhythm signal is not detected within the preset waiting time according to the monitoring instruction from the third determination control module 904 or the fifth determination control module 906, and if so, send the monitoring instruction to the fifth determination control module 906; otherwise, if the second heart rate signal indicated by the heart rate signal detection device 304 is received within the preset waiting time, a moving instruction is sent to the CT gantry moving device 306, and then the second heart rate signal is used as the first heart rate signal, and the operation of determining whether the second heart rate signal indicated by the heart rate signal detection device 304 is not received within the preset waiting time is returned.
The fifth determination control module 906 is configured to determine whether the current scanning view angle coincides with the scanning view angle corresponding to the acquired image data after receiving the monitoring instruction from the fourth determination control module 905, and if the current scanning view angle does not coincide with the scanning view angle corresponding to the acquired image data, control the scanning execution device 301 to increase the X-ray dose, and send the monitoring instruction to the third determination control module 904; otherwise, if the current scanning view angle coincides with the scanning view angle corresponding to the acquired image data, it is determined whether a second rhythm signal indicated by the rhythm signal detection device 304 is received, and if so, a movement indication is sent to the CT gantry moving device 306, and then the second rhythm signal is used as a first rhythm signal and a monitoring indication is sent to the fourth determination control module 905; otherwise, if the second heart rate signal indicated by the heart rate signal detection device 304 is not received, the operation of determining whether the current scanning view angle coincides with the scanning view angle corresponding to the acquired image data is continuously performed.
The image data determination module 907 is configured to determine whether to complete scanning within the image scanning range after receiving a scan segment acquisition completion instruction from the third determination control module 904, and if so, control the scanning execution device 301 to stop scanning and end cardiac CT scanning; otherwise, a monitoring instruction is sent to the second determination control module 903.
In practical applications, the CT gantry moving apparatus 306 in this embodiment may further record the relative position between the CT gantry and the patient table after the cardiac rhythm signal detection apparatus 304 detects the cardiac rhythm signal; upon receiving the movement indication, the CT gantry is moved in the direction of movement of the patient table such that the relative position between the CT gantry and the patient table is at the relative position between the CT gantry and the patient table recorded when the first cardioversion signal was detected.
The third embodiment is illustrated by an example.
Fig. 10a to 10c are schematic views of a step-by-step cardiac CT scan according to an example of the present invention. Fig. 10a shows the condition that the heart rhythm is not abnormal during the scanning process, and fig. 10b and 10c show the condition that the heart rhythm is abnormal during the scanning process.
For the cardiac image scanning range H at the upper left corner in fig. 10a to 10c, the example still takes the division of four scanning segments as an example, in fig. 10a, since no abnormality occurs to the heart rhythm, each scanning segment completes the image data acquisition within the preset scanning view angle range within one cardiac resting period, i.e. four shaded regions as between R01 and R02, between R02 and R03, between R03 and R04, and between R04 and R05 in fig. 10 a. In fig. 10b, after the scanning of the initial scanning segment is completed between R11 and R12, since R13 is detected within a preset waiting time after R12 and R14 is detected within a preset waiting time after R13, that is, a heart rhythm abnormality occurs after R12, the scanning of the second scanning segment is not performed with a high X-ray dose until after R14, and since no heart rhythm abnormality occurs after R14, the scanning of the remaining three scanning segments is completed between R14 and R15, between R15 and R16, and between R16 and R17, respectively. In fig. 10c, after the scanning of the initial scan segment is completed between R21 and R22, R23 is not detected within a preset waiting time after R22, and thus the scanning of the second scan segment is started with a high X-ray dose, but since R23 is detected before the image data acquisition within the preset scan view angle range is completed, that is, a cardiac arrhythmia occurs after R22, only a part of the image data acquisition of the second scan segment is completed between R22 and R23, R24 is detected within the preset waiting time immediately after R23, and a cardiac arrhythmia does not occur after R24, the remaining image data acquisition of the second scan segment is completed between R24 and R25, and then the scanning of the remaining two scan segments is completed between R25 and R26 and between R26 and R27, respectively.
The CT machine provided in the embodiments of the present invention may include a cardiac CT scanning control system in any specific implementation form of the above embodiments.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (13)
1. A method of controlling a cardiac CT scan, comprising:
A. determining an image scanning range of the heart;
B. for each scanning segment in the image scanning range, completing image data acquisition in a preset scanning view angle range in at least one cardiac resting period; the scanning view angles of the image data in different cardiac stationary periods corresponding to a single scanning segment are not coincident and equal to a preset scanning view angle range after accumulation.
2. The method of claim 1, wherein step B comprises:
b1, moving the initial scanning segment of the heart into the scanning area according to the image scanning range;
b2, detecting a first heart rate signal of the heart;
b3, after the first rhythm signal is detected, judging whether a second rhythm signal is not detected within a preset waiting time, if so, starting scanning, and executing the step B4; otherwise, taking the second rhythm signal as a first rhythm signal, and returning to execute the step B3;
b4, judging whether a second rhythm signal is detected before the image data acquisition within the preset scanning view angle range is finished, if so, stopping scanning, taking the second rhythm signal as a first rhythm signal, and executing the step B5; otherwise, stopping scanning after finishing the image data acquisition within the preset scanning view angle range, and executing step B8;
b5, judging whether a second rhythm signal is not detected within the preset waiting time, if so, executing the step B6; otherwise, taking the second rhythm signal as a first rhythm signal, and returning to execute the step B5;
b6, judging whether the current scanning visual angle is coincident with the scanning visual angle corresponding to the collected image data, if not, starting scanning, and returning to execute the step B4; otherwise, go to step B7;
b7, judging whether a second heart rate signal of the heart is detected, if so, taking the second heart rate signal as a first heart rate signal, and returning to execute the step B5; otherwise, returning to execute the step B6;
b8, judging whether the scanning in the image scanning range is finished, if so, ending; otherwise, go to step B9;
b9, moving the next scanning segment of the heart into the scanning area; and returns to performing step B2.
3. The method according to claim 2, wherein the step B9 of moving the next scan segment of the heart into the scan region is: the CT gantry and/or the patient table are moved such that the next scan segment of the heart is located within the scan region.
4. The method of claim 1, wherein step B comprises:
b1, determining the initial scanning position of the spiral scanning according to the image scanning range;
b2, moving the patient table at a set speed;
b3, starting scanning by using low X-ray dose after the initial scanning position enters the scanning area;
b4, detecting a first heart rate signal of the heart;
b5, after the first rhythm signal is detected, judging whether a second rhythm signal is not detected within a preset waiting time, if so, increasing the X-ray dose, and executing the step B6; otherwise, go to step B7;
b6, judging whether a second cardiorhythm signal is detected before the image data acquisition within the preset scanning view angle range is finished, if so, reducing the X-ray dose, and executing the step B8; otherwise, after completing the image data acquisition within the preset scanning view angle range, reducing the X-ray dose, and executing the step B12;
b7, moving the CT gantry along the moving direction of the patient table to make the relative position between the CT gantry and the patient table be at the position when the first rhythm signal is detected, using the second rhythm signal as the first rhythm signal, and returning to execute the step B5;
b8, moving the CT gantry along the moving direction of the patient table so that the relative position between the CT gantry and the patient table is at the position when the first rhythm signal is detected, taking the second rhythm signal as the first rhythm signal, and executing step B9;
b9, judging whether a second rhythm signal is not detected within the preset waiting time, if so, executing the step B10; otherwise, returning to execute the step B8;
b10, judging whether the current scanning view angle is coincident with the scanning view angle corresponding to the collected image data, if not, increasing the X-ray dosage, and executing the step B6; otherwise, go to step B11;
b11, judging whether a second heart rate signal of the heart is detected, if so, returning to execute the step B8; otherwise, returning to execute the step B10;
b12, judging whether the scanning in the image scanning range is finished, if so, stopping scanning and ending; otherwise, return to execute step B4.
5. The method of claim 4, wherein step B5 further comprises: recording a relative position between the CT gantry and the patient table after detecting the first cardioversion signal;
moving the CT gantry in the direction of the patient table movement as described in steps B7 and B8 such that the relative position between the CT gantry and the patient table at the time the first cardioversion signal is detected is: the CT gantry is moved in the direction of movement of the patient table such that the relative position between the CT gantry and the patient table is at the relative position between the CT gantry and the patient table recorded when the first cardioversion signal was detected.
6. The method according to any one of claims 1 to 5, characterized in that the method further comprises: and for each scanning segment of the heart, reconstructing the data of the scanning segment by using the acquired image data in the preset scanning visual angle range.
7. The method of any one of claims 1 to 5, wherein the first and second heart rate signals are R wave signals on an electrocardiogram.
8. A control system for cardiac CT scanning, comprising:
the scanning execution device comprises an X-ray bulb tube as an X-ray source and an X-ray detector for receiving X-rays from the X-ray bulb tube;
the control device comprises an image scanning range determining unit and an image scanning control unit; wherein,
an image scanning range determining unit for determining an image scanning range of the heart;
the image scanning control unit is used for controlling the scanning execution device to complete image data acquisition within a preset scanning view angle range in at least one cardiac resting period for each scanning segment within the image scanning range; the scanning view angles of the image data in different cardiac stationary periods corresponding to a single scanning segment are not coincident and equal to a preset scanning view angle range after accumulation.
9. The system of claim 8, further comprising: a scanning segment moving device and a rhythm signal detecting device; the image scanning control unit includes: the device comprises a first judgment control module, a second judgment control module, a third judgment control module, a fourth judgment control module and an image data judgment module; wherein,
the scanning segment moving device is used for moving an initial scanning segment of the heart to a scanning area according to the image scanning range when scanning is started, and sending a monitoring instruction to the first judgment control module; after receiving the movement instruction of the image data judgment module, moving the next scanning segment of the heart into the scanning area, and sending a monitoring instruction to the first judgment control module;
the heart rhythm signal detection device is used for detecting a first heart rhythm signal and a second heart rhythm signal of a heart and indicating the first heart rhythm signal or the second heart rhythm signal to the first judgment control module, the second judgment control module, the third judgment control module and the fourth judgment control module when the first heart rhythm signal or the second heart rhythm signal is detected;
the first judgment control module is used for judging whether a first heart rate signal indicated by the heart rate signal detection device is received or not after receiving a monitoring instruction from the scanning segment mobile device, judging whether a second heart rate signal indicated by the heart rate signal detection device is not received within preset waiting time or not after receiving the first heart rate signal, controlling the scanning execution device to start scanning if the second heart rate signal is not received within the preset waiting time, and sending the monitoring instruction to the second judgment control module; if the second heart rate signal indicated by the heart rate signal detection device is received within the preset waiting time, the second heart rate signal is used as the first heart rate signal, and the operation of judging whether the second heart rate signal indicated by the heart rate signal detection device is not received within the preset waiting time is returned;
the second judgment control module is used for judging whether a second cardioversion signal indicated by the cardioversion signal detection device is received before the scanning execution device finishes image data acquisition in a preset scanning visual angle range after receiving a monitoring instruction from the first judgment control module or the fourth judgment control module, if so, controlling the scanning execution device to stop scanning, taking the second cardioversion signal as a first cardioversion signal, and sending a monitoring instruction to the third judgment control module; otherwise, after the scanning execution device finishes the image data acquisition within the preset scanning visual angle range, controlling the scanning execution device to stop scanning, and sending a scanning segment acquisition finishing instruction to the image data judgment module;
the third judgment control module is used for judging whether a second heart rate signal indicated by the heart rate signal detection device is not received within the preset waiting time after receiving the monitoring indication from the second judgment control module or the fourth judgment control module, and if so, sending the monitoring indication to the fourth judgment control module; if the second heart rate signal indicated by the heart rate signal detection device is received within the preset waiting time, the second heart rate signal is used as the first heart rate signal, and the operation of judging whether the second heart rate signal indicated by the heart rate signal detection device is not received within the preset waiting time is returned;
the fourth judgment control module is used for judging whether the current scanning visual angle is overlapped with the scanning visual angle corresponding to the collected image data after receiving the monitoring instruction from the third judgment control module, controlling the scanning execution device to start scanning if the current scanning visual angle is not overlapped with the scanning visual angle corresponding to the collected image data, and sending the monitoring instruction to the second judgment control module; if the current scanning visual angle is not coincident with the scanning visual angle corresponding to the acquired image data, judging whether a second rhythm signal indicated by the rhythm signal detection device is received or not, if so, taking the second rhythm signal as a first rhythm signal, and sending a monitoring indication to a third judgment control module; if the second heart rhythm signal indicated by the heart rhythm signal detection device is not received, continuing to execute the operation of judging whether the current scanning visual angle is overlapped with the scanning visual angle corresponding to the acquired image data;
the image data judgment module is used for judging whether the scanning within the image scanning range is finished or not after receiving a scanning segment acquisition finishing instruction from the second judgment control module, and if so, ending the cardiac CT scanning; otherwise, sending a movement instruction to the scanning segment moving device.
10. The system of claim 9, wherein the scan segment moving means is: a table mover and/or a CT gantry mover.
11. The system of claim 8, further comprising: the system comprises an inspection table moving device, a CT rack moving device and a rhythm signal detection device; the image scanning control unit includes: the device comprises an initial scanning position determining module, a first judging control module, a second judging control module, a third judging control module, a fourth judging control module, a fifth judging control module and an image data judging module; wherein,
the initial scanning position determining module is used for determining the initial scanning position of the spiral scanning according to the image scanning range;
the examination table moving device is used for moving the patient examination table at a set speed;
the first judgment control module is used for controlling the scanning execution device to start scanning with low X-ray dosage after judging that the initial scanning position enters the scanning area, and sending a monitoring instruction to the second judgment control module;
the heart rhythm signal detection device is used for detecting a first heart rhythm signal and a second heart rhythm signal of a heart and indicating the first heart rhythm signal or the second heart rhythm signal to the second judgment control module, the third judgment control module, the fourth judgment control module and the fifth judgment control module when the first heart rhythm signal or the second heart rhythm signal is detected;
the second judgment control module is used for judging whether a first rhythm signal indicated by the rhythm signal detection device is received or not after receiving the monitoring indication of the first judgment control module or the monitoring indication of the image data judgment module, judging whether a second rhythm signal indicated by the rhythm signal detection device is not received within preset waiting time or not after receiving the first rhythm signal, and if so, controlling the scanning execution device to increase the X-ray dosage and sending a monitoring indication to the third judgment control module; if the second heart rate signal indicated by the heart rate signal detection device is received within the preset waiting time, sending a movement instruction to the CT rack moving device, taking the second heart rate signal as the first heart rate signal, and returning to execute the operation of judging whether the second heart rate signal indicated by the heart rate signal detection device is not received within the preset waiting time;
the third judgment control module is used for judging whether a second cardioversion signal indicated by the cardioversion signal detection device is received before the scanning execution device finishes image data acquisition within a preset scanning visual angle range after receiving a monitoring instruction from the second judgment control module or the fifth judgment control module, if so, controlling the scanning execution device to reduce X-ray dosage, sending a movement instruction to the CT rack moving device, then taking the second cardioversion signal as a first cardioversion signal, and sending a monitoring instruction to the fourth judgment control module; otherwise, after the scanning execution device finishes the image data acquisition within the preset scanning visual angle range, controlling the scanning execution device to reduce the X-ray dosage and sending a scanning segment acquisition finishing instruction to the image data judgment module;
the CT rack moving device is used for moving the CT rack along the moving direction of the patient examination table according to the moving instruction from the second judgment control module, the third judgment control module, the fourth judgment control module or the fifth judgment control module, so that the relative position between the CT rack and the patient examination table is the position when the cardiac rhythm signal detection device detects the first cardiac rhythm signal;
the fourth judgment control module is used for judging whether the second rhythm signal is not detected within the preset waiting time according to the monitoring instruction from the third judgment control module or the fifth judgment control module, and if so, sending the monitoring instruction to the fifth judgment control module; if the second heart rate signal indicated by the heart rate signal detection device is received within the preset waiting time, sending a movement instruction to the CT rack moving device, taking the second heart rate signal as the first heart rate signal, and returning to execute the operation of judging whether the second heart rate signal indicated by the heart rate signal detection device is not received within the preset waiting time;
the fifth judgment control module is used for judging whether the current scanning visual angle is overlapped with the scanning visual angle corresponding to the collected image data or not after receiving the monitoring instruction from the fourth judgment control module, if not, controlling the scanning execution device to increase the X-ray dosage and sending the monitoring instruction to the third judgment control module; if the current scanning visual angle is not coincident with the scanning visual angle corresponding to the acquired image data, judging whether a second rhythm signal indicated by the rhythm signal detection device is received or not, if so, sending a movement indication to the CT rack moving device, taking the second rhythm signal as a first rhythm signal, and sending a monitoring indication to a fourth judgment control module; if the second heart rhythm signal indicated by the heart rhythm signal detection device is not received, continuing to execute the operation of judging whether the current scanning visual angle is overlapped with the scanning visual angle corresponding to the acquired image data;
the image data judgment module is used for judging whether the scanning within the image scanning range is finished or not after receiving the scanning segment acquisition finishing instruction from the third judgment control module, and if so, controlling the scanning execution device to stop scanning and finish the cardiac CT scanning; otherwise, sending a monitoring instruction to the second judgment control module.
12. The system of claim 11, wherein the CT gantry moving means further records the relative position between the CT gantry and the patient table after the cardiac rhythm signal is detected by the cardiac rhythm signal detecting means; upon receiving the movement indication, the CT gantry is moved in the direction of movement of the patient table such that the relative position between the CT gantry and the patient table is at the relative position between the CT gantry and the patient table recorded when the first cardioversion signal was detected.
13. A CT machine comprising a control system for cardiac CT scanning according to any one of claims 8 to 12.
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| CN107157504A (en) * | 2017-05-31 | 2017-09-15 | 上海联影医疗科技有限公司 | A Control Method of Helical CT Scanning |
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